[pythonyx135793]

/claim #1659

Adds live IN (SELECT ...) and NOT IN predicates to WHERE. Each inner query feeds a stateful selection processor alongside the outer stream. Changes on either side produce the matching inserts, updates and deletes; duplicate inner values are reference-counted, and duplicate outer rows keep their multiplicity.

This also handles NULL/empty results, compound predicates, multiple or nested subqueries, and the planner's projections, joins, grouping/HAVING, CTEs and UNION. The existing static-IN path stays intact. Unsupported correlation, row-valued membership and unsupported relational clauses return explicit errors.

Validation on Linux, Rust 1.77.2, source 80027f3d:

• SQL, expression and core default-feature suites: 332 passed, zero failures, one pre-existing ignored test.
• Changed-source formatting, scoped Clippy and the actual source → SQL → DAG → sink demo passed.
• The same public-API regression fails against the original source because dynamic membership is unsupported there.
• Real-DAG tests cover changing membership, all outer update transitions, duplicates, NULLs, batches, lexical CTE scope, nested DISTINCT, UNION update atomicity, and CTE-backed windows on either JOIN side and chained joins. TTL/nested-operator checks cover construction, not expiration behavior.

Validation run · Demo video

The demo shows actual engine output with its original timing. dozer-sql/tests/DYNAMIC_IN.md explains the support boundaries and how to run it. Retained state is in memory; general compound predicates can require a scan of retained rows when membership changes.

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